S
M
T
W
T
F
S
30
74°
53°
31
74°
59°
1
68°
60°
2
70°
63°
3
80°
61°
4
79°
57°
5
74°
53°
6
71°
50°
7
75°
56°
8
72°
53°
9
75°
59°
10
80°
58°
11
74°
55°
12
72°
55°
13
73°
56°
14
68°
55°
15
70°
48°
16
68°
53°
17
72°
48°
18
66°
45°
19
73°
51°
20
74°
49°
21
70°
48°
22
70°
49°
23
68°
51°
24
70°
47°
25
68°
46°
26
70°
51°
27
70°
51°
28
69°
45°
29
61°
42°
30
63°
43°
1
61°
40°
2
60°
43°
3
59°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Great Barrington
Great Barrington's September 2026 forecast shows daily high temperatures ranging from 59° to 80°, with overnight lows between 40° and 63°. The average high for September is 70° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Great Barrington. See also: October | November | December.
